PDF malware analysis — malicious · 5fe45d90e9fc7ae3

MALICIOUS

PDF

2.7 KB

MD5: ea08f41b3d659b8cc5593308bc6d0658 SHA-1: 0132b19c2acf43e2c594d0ee5726cadf0dd8c286 SHA-256: 5fe45d90e9fc7ae3908f3a9ff179540e7093b5120c778ee54a228a7aa0e0bdd8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript streams that are heavily obfuscated and utilize eval() and String.fromCharCode() functions. These scripts are designed to execute arbitrary code, indicating an attempt to exploit a vulnerability within the PDF reader. The primary function of the JavaScript appears to be downloading and executing a secondary payload, as suggested by the exploit cluster heuristics and the nature of the obfuscated code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `587f0f0603df0015cc4349c2e84e7fed6111c83afd4be7869c88e52a616c1730`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `f66090db93464aa4c36f573e80ef5d1bae3c9ae7587adecaf22966f3379f6997`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3350 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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